We could do this with out Frida Kahlo self-portraits--make them "selfies"! Fun, contemporary back-to-school lesson! Have your students draw "selfies" and describe their summer via text message prompts. Makes for a great bulletin board display!
Lego Fraction game: Love this example for students who are into Legos. This is a great way for students to learn commonly used fractions in an exciting way. It supports the NCTM standard of representing commonly used fractions.